輪軸

轮轴
lúnzhóu
  1. wheel and axle (mechanism)
  2. axle

CEDICT

wheel and axle

Wiktionary

利用槓桿原理製成的省力機械。由相互固定的輪子和同心軸組成。在輪的邊緣施力使其轉動，軸也隨之轉動。由於輪子的半徑大於軸的半徑，轉動輪子的力量可以在軸上產生更大的力量，藉以捲縮軸上的繩子而升高重物，省力的倍數和輪與軸的半徑比有關。輪和軸的半徑比愈大就愈省力，上昇的高度則相對減少。轆轤、絞盤都是輪軸類機械。

重編國語辭典

輪和軸的組合

維基詞典

Entry Composition

1 輪 lún
  1. wheel; disk; ring
  2. steamship
  3. to take turns; to rotate
  4. classifier for big round objects: disk, or recurring events: round, turn
2 軸 zhóu
  1. axis
  2. axle
  3. spool (for thread)
  4. roller (for scrolls)
  5. classifier for calligraphy rolls etc

Related entries

車軸 chēzhóu axle

classifier: 根
軸心 zhóuxīn
  1. axle
  2. (fig.) central element
  3. key element
  4. axis (alliance of nations)
軸 zhóu
  1. axis
  2. axle
  3. spool (for thread)
  4. roller (for scrolls)
  5. classifier for calligraphy rolls etc
地球每二十四小時就會繞軸自轉一周。

The earth revolves on its axis once every 24 hours.

Source: Tatoeba